Abstract
An energy transfer between donor and acceptor fluorophores across single lipid bilayer membranes is demonstrated. Anilino-naphthalene sulfonate is used as the donor chromophore: its fluorescence is enhanced by the presence of lipid and thus indicates association with the purely lipid membranes of our preparation of vesicles in suspension. Light emit ted by the donor molecules excites fluorescence of acriflavine, a suitable acceptor enclosed inside the vesicles. Absorption and fluorescence spectra of this system, in its components and as a whole, are presented in evidence for an energy transfer.
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